SAP B1 is a midmarket product which SAP purchased along with TopTier about a decade ago. Working with SAP B1 has very little similarity with working with SAP ECC (formerly R3). Your experience consulting on MM business processes will be similar, but you'll need to get experience configuring SAP before you can think about certification or consulting on SAP ECC. So, to reiterate what everyone else has said, no one will hire you for R3 consulting jobs based on your B1 experience. There is no possibility of jumping directly from B1 to R3 consulting but you might be able to secure an in-house (not consulting) job doing SAP ECC config based on your business process knowledge.

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